Improvement in depthing-tools



A. SCHWERTER. DEPTHING-Toox..

Patented Jan.1l,1876.

Eagle.

N- FETES, Fl401'@UTHOGRAPHERl WASHINGYDN. D C.

` UNrrED STATES f PATENT; FFIGE AUeUsrUs soawnnrnn, or New vonk, n. Y.

IMPRovEMENT IN nEPTHINe-TooLs.

Specification forming part of Letters Patent No. 172,183, dated January 11, 1876; application tfiled November 4, 1875. "i l To all whom it may concern j Be it known that I,.AUG"Us'rUs Sortware, TER, ofthe city, county, and State of New York, have invented a new and Improved Depthing-Tool, which invention is fully set forth in the following specification, reference being had to the accompanying drawing, in` which- Figure 1 represents a side View. Fig. 2 is a transverse section. Fig. 3 is. a side view of. the cutter-head and spring detached. The remaining figures are details, which will be referred to as the description progresses.

Similar letters indicate corresponding parts. This invention consist-s in the combination of a cutter-head with a spindle, which is provided with a long tapering point, said cutterhead being furnished with a spring-clamp, so that it can be readily secured toany part of the spindle, and that' when the tapering end ot' said spindle has been inserted into a hole of any desired size in a plate of metal or other material, the cutter or cutters contained in the cutterheadcan be readily adjusted to produce the desired cavity round the edge of -said hole, or to enlarge said hole, such cavity or enlargement being perfectly concentric with the original hole. The spindle is provided. with a guide-groove, which receives the inner edge of the depthing-cutter, and also the point of a screw secured in the cutter-head,

so that both the cutter and the cutter-head` are steadied in their position. With the taperin g spindle, the cutter-head, and the depthin g-cutter, are combined an adjustable rimcutter and an adjustable gage, the rim-cutter being used in setting jewels, and the gage serving to control the depth ot' the cavity or cavities to be produced by my tool.

In the drawing, the letter A designates a spindle, which is provided with a long tapering point, a, so that it can be inserted in holes of various sizes. On this spindle is fitted a cutter-head, B, which is provided at one end with an eye, b, large enough to admit the cylindrical part ofthe spindle A while its oppositel end is bifurcated and provided with clampingscrews c for the purpose oi securing the cutters, as will be presently more fully explained. With this cutter-head is combined a springclamp, d, which adjusts litself automatically spindle.

tothe variable thickness of the tapering portion of the spindle, and which is provided with a set-screw, c, by means ot which the cutterh'ead can be fastened on any portion of the Through the cutter-head, near its rear end, extends a screw, f, the point of which engages with a groove, g, (see Fig. 14,) in the spindle., so as to prevent said cutterhead from turning on the spindle after it has been adjusted on the saine. The groove g may be madeof any desired depth, and it extends clear out to the point of the spindle.

The cutters which I use in my cutter-head are ot' various forms or shape,.according to the work to be accomplished.

For sinking jewels in watch-plates, for instance, I use a rim-cutter, h, a depthing-cutter, i, and a gage,]c, detached views ot' which are shown in Figs. 4, 5, and 6. The depthingcutter is provided with round holes, which tit the clamping-screws c in the cutter-head, while the rim-cutter and the gage are provided with slots, so that they can be adjusted in the cn tter-head. The inner edge ot the depthingcutterprojects into the groove g, so that when the cutter-head is secured in position said groove sustains the depthing-cuttcr lirinly in position, and the danger of breaking said cutter is materially reduced. The eli'ect produced by the combined action of the depthingcutter, the rim-cutter, and the gage', is illustrated in Fig. 7, which showsv a section of a metal plate, l, in which is 'bored a hole, m, ot' the size required. After this hole has been bored I insert therein the tapering end of the spindle A, and then I slide the cutter-head B down until the points ot' the cutters t' and h touch the surface of the plate. I then secure the cutter-head by means of its set-screw, and by imparting to the spindle a rotary motion, either by means of a hand-drilling bow or by inserting the saine in a turning bench or lathe, cavities p q are produced round the edge of the hole m, leaving a thin raised rim, n, and a shoulder, o. The jewel is placed on this shoulder, and, by pressing the rim n. inward, said jewel is tirinly retained in position. By adjusting the gage 7c the depth of the cavities 19 q can be regulated, and jewels ot' various thickness and diameter can thus be set with the greatest facility. My tool can also be used for sinking excavations for screwheads of various shapes, or for sinking gearwheels or other parts, as shown in Figs. 9, 11, and 13. For producing the cavity 1', Fig. 9, I use the cutter s, Fig. 8, which is secured in the cutter-head, either alone or' together with` the gage k. For producing thecavity t, Fig. 11, I use the cutter u, Fig. 10, and for producing the cavity c, Fig. 13, I use the Acutter w, Fig. 12. The inner edges of all these cutters are guided in the groove g of the spindle. It' desired, this groove may be cut clear through the spindle, (the ends of the spindle being left solid,) so that cutters can be used Whichproject from both sides 0f the spindle. This arrangement will be of advantage, particularly in producing'cavities, such as shown in Fig. 13, for the reception of gearywheels.'

Fromthis description it will be seen that my tool can beused for sinking Watch, clock,

Vor other jewel-settings, and also for-making circular excavations of any diameter vand depth into any plate or piece of metal, lvo'ry,

amber, horn, bone, or other similar material having, already a holeI for the reception of the spindle. My tool can also be used for enlarging holes vpreviously bored, and in all cases the excawtions` or enlargements will be concentric With the original hole.

What I claim as new, and desire to secure by Letters Patent, is-

1. The combination, with the tapering spin. die A,'ot` the spring-clamp d, cutter-head B,

and a cutter (one or more) connected with said cutter-head, and constructed to be detached therefrom, as and for the purpose specified.

2. The combination of the guide-groove g in the spindle A with the cutter-head B, screw f, and with the cutter secured in said cutterhead, substantially as and for the purpose set forth.

3. The combination, with the spindle'A and cutter-head B, of a depthing-cutter, i, and a rim-cutter, h, with or Without a gage, 7c, substantiallyas shown 4and described.

lIn testimony that I claim the foregoing I vhave hereunto set my hand and seal this 3d 'day of November, 1875.

AUG. .SGHWERTER Witnesses:

JN0. D. `PATTEN, `E. F. KASTENHUBER. 

